Which statement about pesticide storage facilities is true?

The statement regarding carefully considering the terrain when selecting a storage site for pesticides is true because the characteristics of the terrain can significantly impact the safety and efficacy of pesticide storage. A suitable site must be level, away from water sources, and have good drainage to prevent runoff or contamination in the event of spills. Additionally, the terrain should be stable to avoid erosion or other environmental impacts. Proper site selection enhances safety, ensuring that the likelihood of accidental exposure or environmental hazards is minimized.

The other options do not adequately reflect best practices for pesticide storage. For instance, a ventilation system should not vent air into adjoining areas; it is meant to exhaust harmful vapors outside to protect nearby persons and the environment. Keeping the floor as bare soil is not advisable because a solid, impermeable floor helps contain spills and allows for easier cleanup. High humidity in storage areas can lead to mold growth or damage to the pesticide products; thus, maintaining appropriate humidity levels is crucial for product integrity.